Example for transforming custom blocks broken

[cawa-93]

Related plugins

• plugin-vue

• plugin-vue-jsx

Describe the bug

I casually copy Example for transforming custom blocks from docs and it doesn't work.

My component

<script setup></script>

<template>
  <div>Hello</div>
</template>

<i18n lang="json">
{ "message": "hello" }
</i18n>

According to docs transformed code looks like this:

export default Comp => {
	Comp.i18n = export const message = "hello";
	export default {
		message: message
	};
}

Reproduction

https://stackblitz.com/edit/vitejs-vite-a3mpsu?file=vite.config.js

Steps to reproduce

No response

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.20.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 9.4.2 - /usr/local/bin/npm
    pnpm: 8.6.3 - /usr/local/bin/pnpm
  npmPackages:
    @vitejs/plugin-vue: ^4.2.3 => 4.2.3 
    vite: ^4.4.4 => 4.4.4

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[Plumbiu]

I guess we are using "yaml", so this code <i18n lang="json"> should be written like this <i18n lang="yaml">

you can see here：https://stackblitz.com/edit/vitejs-vite-gfchex